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Wyświetlanie 1-15 z 17
Tytuł:
Itinerant Theory of Exchange Constants in Diluted Co-Based Semimagnetic Semiconductors
Autorzy:
Mašek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1888118.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.30.Ef
75.50.Pp
Opis:
The exchange constants in diluted semimagnetic semiconductors with Co are much larger than in the Mn doped systems. To explain this, we use a semiquantitative, tight binding version of the coherent potential approach and calculate the electronic structure of II-VI mixed semiconductors containing Co and Mn. The exchange constants are deduced from energies of spin reversal processes. The presence of the Co 3d states at the top of the valence band leads to the observed enhancement of the exchange coupling.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 267-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Compensating Incorporation of Mn in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As
Autorzy:
Mašek, J.
Máca, F.
Powiązania:
https://bibliotekanauki.pl/articles/2027482.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
71.55.Eq
75.50.Pp
Opis:
We consider hypothetical Ga$\text{}_{7}$MnAs_8, Ga$\text{}_{16}$MnAs$\text{}_{16}$, and Ga$\text{}_{14}$Mn$\text{}_{3}$As$\text{}_{16}$ crystals with Mn in a substitutional, interstitial, and both positions. Spin-polarized full-potential linearized augmented plane wave calculations were used to obtain their electronic structure. We show that the interstitial Mn acts as a double donor and compensates the holes created by two Mn atoms in substitutional positions. This explains why the number of holes in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As is much smaller than x. The presence of interstitial atoms may also be the reason for the lattice expansion with increasing content of Mn. The differences in electronic behavior of substitutional and interstitial Mn are discussed.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 319-325
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disorder-Induced Effects in III-V Semiconductors with Mn
Autorzy:
Mašek, J.
Máca, F.
Powiązania:
https://bibliotekanauki.pl/articles/2035606.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
71.55.Eq
75.50.Pp
Opis:
The substitution of Mn in the III-V diluted magnetic semiconductors leads to a strong electron scattering on impurities. Besides the features induced in the valence band by the hybridization with the Mn d-states, also the conduction band is affected by the absence of the Mn s-states at its edge. Also the high concentration of compensating donors modifies the band structure. This is shown on the absorption coefficientε$\text{}_{2}$(ω) of GaP doped with Mn and Se. The absorption evaluated by ab initio density functional calculations starts with a smooth tail and does not show the structure typical of III-V materials. We analyze these features and the role of the donors on model systems using the tight-binding coherent potential approach.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 667-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitation of Electron Wave Packets in Low-Dimensional Semiconductor Structures by Inhomogeneous Light Pulses
Autorzy:
Král, P.
Mašek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1921602.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.90.+y
78.90.+t
Opis:
Generation of electron wave packets by space inhomogeneous light pulses is studied in low-dimensional semiconductor systems. Examination of their free propagation for ultrashort times as well as in the stationary excitation regime is performed. Non-classical effects related to the inhomogeneity of the source are predicted.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 697-701
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Expansion of (Ga,Mn)As: The Role of Substitutional Mn and of the Compensating Defects
Autorzy:
Mašek, J.
Máca, F.
Powiązania:
https://bibliotekanauki.pl/articles/2044505.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
71.55.Eq
75.50.Pp
Opis:
We apply the density-functional technique to determine the lattice constant of GaAs supercells containing Mn$\text{}_{Ga}$, Mn$\text{}_{int}$, and As$\text{}_{Ga}$ impurities, and use a linear interpolation to describe the dependence of the lattice constant a of Ga$\text{}_{1-x}$Mn$\text{}_{x}$As on the concentrations of these impurities. The results of the supercell calculations confirm that Mn$\text{}_{Ga}$ does not contribute to the lattice expansion. The increase in a is due to both Mn$\text{}_{int}$ and As$\text{}_{Ga}$, that are both created in the as-grown (Ga,Mn)As in proportion to x, and that are most probably present in a remarkable amount also in the best annealed materials.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 789-794
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of Electronic Structure of SnTe Due to High Concentration of Sn Vacancies
Autorzy:
Mašek, J.
Nuzhnyj, D. N.
Powiązania:
https://bibliotekanauki.pl/articles/1968370.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
71.20.Nr
Opis:
Non-stoichiometric Sn$\text{}_{1-y}$Te is a strongly degenerated n-type semiconductor. This is important for understanding unusual features of magnetic behaviour of Sn$\text{}_{1-x}$Gd$\text{}_{x}$Te where the relative positions of the Fermi energy and the atomic d-level of Gd govern the exchange coupling. The influence of the Sn vacancies on the band structure cannot be neglected if their concentration reaches a few atomic percent. We address this problem by using a tight-binding coherent potential approach and show that although the character of the bands remains unchanged, they are modified so that ε$\text{}_{d}$ can come out above the heavy-hole band.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 915-918
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety of high-capacity goods transportation by railways
Autorzy:
Kendra, M.
Mašek, J
Babin, M
Powiązania:
https://bibliotekanauki.pl/articles/359700.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
load
fixing
goods
railway infrastructure
parameters
safety
Opis:
One of the most important characteristics of the railway transport is a safety. Different types of transported goods properties need individual approach to prepare safety goods transportation. It is important to load and fix goods in railway wagons in well done way to reduce the number of accidents on the railway. The bad way of loading and fixing of the goods in the railway wagons can bring a very dangerous results as a damage of the transported goods or accident of the train. This paper deals with the analysis of the railway infrastructure parameters, which affect the well done way of loading and fixing of goods in railway wagons for highcapacity transport.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 39 (111); 87-93
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interstitial Mn in (Ga,Mn)As: Hybridization with Conduction Band and Electron Mediated Exchange Coupling
Autorzy:
Mašek, J.
Kudrnovský, J.
Máca, F.
Jungwirth, T.
Powiązania:
https://bibliotekanauki.pl/articles/2047379.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
75.50.Pp
Opis:
We investigate theoretically the possibility of n-type DMS based on III-V materials with Mn impurities in interstitial instead of substitutional positions, and discuss some situations when this can happen. We show that the d-states at interstitial Mn atoms in (Ga,Mn)As hybridize with both valence and conduction bands. The hybridization is strong enough to establish an indirect ferromagnetic coupling of the Mn magnetic moments mediated either by holes or by conduction electrons. Moreover, the Curie temperatures estimated within the mean-field theory are comparable with T$\text{}_{c}$ obtained for conventional materials with the same concentration of Mn$\text{}_{Ga}$.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 215-219
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Exchange Interactions in II-VI, III-V, and I-II-V Dilute Magnetic Semiconductors: Density Functional Approach
Autorzy:
Mašek, J.
Kudrnovský, J.
Máca, F.
Jungwirth, T.
Powiązania:
https://bibliotekanauki.pl/articles/2046931.pdf
Data publikacji:
2006-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
71.55.Eq
75.50.Pp
Opis:
We use the coherent potential method based on the density-functional theory to compare the electronic structures and magnetic characteristics of mixed crystals (Ga,Mn)As, (Zn,Mn)Se, and Li(Zn,Mn)As. We show that, with the same degree of doping, the magnetic behavior of these materials is very similar, reflecting the similarity of their electronic structures. In particular, the superexchange in (Ga,Mn)As is as strong as in (Zn,Mn)Se and the ferromagnetic coupling in all these dilute magnetic semiconductors becomes dominant only at sufficient concentration of the holes. Remarkably, we find that ferromagnetic state appears not only in p-type, but also in n-type materials at a comparable level of doping. Although obtaining strongly n-type doped III-V dilute magnetic semiconductors is improbable, Li(Zn,Mn)As seems to be a promising candidate for a ferromagnetic n-type semiconductor.
Źródło:
Acta Physica Polonica A; 2006, 110, 2; 249-254
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Diluted Semimagnetic Semiconductor (Cd,Co)Se
Autorzy:
Cháb, V.
Mašek, J.
Orłowski, B. A.
Kowalski, B. J.
Powiązania:
https://bibliotekanauki.pl/articles/1890829.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.50.Pp
79.60.Eq
Opis:
The electronic structure of a new semimagnetic semiconductor (Cd,Co)Se is studied by UPS and calculated by a tight-binding version of the disordered-local-moment theory. The theory accounts for the chemical disorder and for electron interactions within the Co 3d$\text{}^{7}$ shells. Both theory and experiment show Co 3d states deep in the valence band and also at the band edge. The last state seem to be responsible for unique properties of the Co-based semimagnetic semiconductors.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 333-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlated Doping in Semiconductors: the Role of Donors in III-V Diluted Magnetic Semiconductors
Autorzy:
Mašek, J.
Turek, I.
Drchal, V.
Kudrnovský, J.
Máca, F.
Powiązania:
https://bibliotekanauki.pl/articles/2035608.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
71.55.Eq
75.50.Pp
Opis:
We investigate the compositional dependence of the total energy of the mixed crystals (Ga,Mn)As co-doped with As, Sn, and Zn. Using the ab initio linear muffin-tin orbital coherent potential approximation method we find a correlation between the incorporation of acceptors (Mn, Zn) and donors (Sn, antisite As). In particular, the formation energy of As$\text{}_{Ga}$ is reduced by approximately 0.1 eV in the presence of Mn, and vice versa. This leads to the self-compensating behavior of (Ga,Mn)As.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 673-678
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compositional Dependence of the Formation Energies of Substitutional and Interstitial Mn in Partially Compensated (Ga,Mn)As
Autorzy:
Mašek, J.
Turek, I.
Kudrnovský, J.
Máca, F.
Drchal, V.
Powiązania:
https://bibliotekanauki.pl/articles/2038147.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.20.Nr
71.55.Eq
75.50.Pp
Opis:
We use the density-functional theory to calculate the total energy of mixed crystals (Ga,Mn)As with a small concentration of various donors. We find that the formation energy of Mn depends strongly on the partial concentrations of Mn in the substitutional and interstitial positions, and on the concentration of other dopants. The composition dependence of the formation energies represents an effective feedback mechanism, resulting in the self-compensation property of (Ga,Mn)As. We show that the partial concentrations of both substitutional and interstitial Mn increase proportionally to the total concentration of Mn.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 637-644
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal and application of methodology of revitalisation of regional railway track in Slovakia and Serbia. Part 2: State of regional transport in Slovakia and Serbia
Vorschlag und Anwendung der Methode Revitalisierung regionale Bahnstrecke in der Slowakei und Serbien. Teil 2: Situation des Regionalverkehrs in der Slowakei und Serbien und Anwendungsmöglichkeit revitalisierung Methode
Autorzy:
Mašek, J.
Kendra, M.
Čamaj, J.
Milinković, S.
Vesković, S.
Powiązania:
https://bibliotekanauki.pl/articles/374340.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
public transport
regional railway transport
suburban railway transport
revitalization of railway line
transport publiczny
transport kolejowy regionalny
transport kolejowy podmiejski
rewitalizacja linii kolejowej
Opis:
This paper discusses a proposal of methodology of revitalisation of regional railway tracks and regional railway traffic, liberalization and competition in railway transport, quality requirements in regional traffic, principles of the contract on transport services in the public interest and with the current state of regional passenger transport in Slovakia and Serbia. This is Part 2 which is dedicated to study the current situation of regional railway transport in Slovakia and Serbia, the investment plans, the potential changes on the railway transport market and the quality of transport service provided in these countries.
Arbeit beschäftigt sich mit Vorschlag der Methodik der Wiederbelebung der regionalen Eisenbahnlinien und regionalen Bahnverkehr, Liberalisierung und Wettbewerb im Eisenbahnverkehr, Qualitätsanforderungen im Regionalverkehr, Grundsätze des Vertrags auf Verkehrsleistungen im öffentlichen Interesse und mit dem Stand der regionalen Personenverkehr in der Slowakei und Serbien. Zweiter Teil der Arbeit beschäftigt sich die Situation der regionalen Eisenbahnverkehr und Änderung auf dem Eisenbahnverkehrsmarkt in der Slowakei und Serbien und mit der Möglichkeit der Anwendung der Methodik und Revitalisierung dieser Staaten.
Źródło:
Transport Problems; 2015, 10, 4; 107-119
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal and application of methodology of revitalisation of regional railway track in Slovakia and Serbia. Part 1: Theoretical approach and proposal of methodology for revitalisation of regional railways
Vorschlag und Anwendung der Methode Revitalisierung regionale Bahnstrecke in der Slowakei und Serbien, Teil 1: Theoretischer Ansatz and Vorschlags der Methode zur Revitalisierung Regionalbahnen
Autorzy:
Mašek, J.
Kendra, M.
Milinković, S.
Vesković, S.
Bárta, D.
Powiązania:
https://bibliotekanauki.pl/articles/375514.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
public transport
regional railway transport
suburban railway transport
revitalisation
transport publiczny
transport kolejowy regionalny
transport kolejowy podmiejski
rewitalizacja kolei
Opis:
The paper presents a proposal of methodology for revitalisation of regional railway tracks and regional railway traffic, liberalization and competition in railway transport, quality requirements in regional traffic, principles of the contract on transport services in the public interest and with the current state of regional passenger transport in Slovakia and Serbia. First part of the paper deals with a theoretical approach of transport policy, transport regulation, suburban transport and introduces a methodology for revitalisation of regional railway tracks.
Arbeit beschäftigt sich mit Vorschlag der Methodik der Wiederbelebung der regionalen Eisenbahnlinien und regionalen Bahnverkehr, Liberalisierung und Wettbewerb im Eisenbahnverkehr, Qualitätsanforderungen im Regionalverkehr, Grundsätze des Vertrags auf Verkehrsleistungen im öffentlichen Interesse und mit dem aktuellen Stand der regionalen Personenverkehr in der Slowakei und Serbien. Ersten Teil der Arbeit beschäftigt sich mit theoretischen Ansatz der Verkehrspolitik, Verkehrsregelung, Vorortverkehr und die Vorbereitung Methodik der Wiederbelebung der regionalen Eisenbahnlinien.
Źródło:
Transport Problems; 2015, T. 10, z. spec.; 85-95
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cd_{1-x}Fe_{x}Te Ternary Crystal Formation Studied by Resonant Photoemission
Autorzy:
Guziewicz, E.
Kowalski, B. J.
Gołacki, Z.
Orłowski, B. A.
Johnson, R. L.
Masek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968113.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Fx
79.60.-i
Opis:
A resonant photoemission was used to study the ternary crystal formation, when small amount of Fe atoms was deposited (in one monolayer range of thickness) on the clean CdTe(100) surface. The constant initial state spectra taken near the Fe 3p-3d transition after Fe deposition and then again after heating process show the existence of two Fano-like resonance. The differences of the energy distribution curves taken for both resonance and antiresonance, respectively, allow us to distinguish two kind of Fe 3d contributions to the valence band: one derived from the metallic Fe islands on the surface and the second - derived from the Fe atoms built into the Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te crystal.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 793-796
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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